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JBL's Tiny amps

JBL's stylish MS Series "Tiny" amps measure only 7" by 8" so you can tuck one into virtually any hiding place that has adequate ventilation. Or you can mount one in a prominent spot to show off the bright digital display with its tone and gain settings. These unique amps come with a setup CD and include built-in indicators that help you set the input level perfectly. They also feature preamp and speaker-level inputs so you can hook them up to almost any system.

Digital signal processing

The MS-A5001 sends 500 watts RMS to your sub at either 2 or 4 ohms. Digital processing makes tuning this amp virtually a snap. It offers a wide selection of crossover points and gives you a choice of three filter slopes to get just the right tone to your music's bass.

Sophisticated circuitry

An optional remote bass controller does much more than just turn this amp up and down. This wireless controller works with multiple MS Series amps at the same time, coordinating the low frequencies of all the amps to blend smoothly so you don't get a bunch of mud when you boost the bass. A signal-sensing turn-on circuit eliminates the need for a separate lead from your receiver, and a special input mode allows this amp to work even when there's a factory amplifier in your car's system.

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

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Features

Digital Signal Processing: The MS-A5001 is a mono subwoofer
amplifier with a digital signal processor (DSP) built in to control input mixing,
crossover settings, and output level. Once the gain is adjusted for the incoming
signal, it is converted from analog to digital and routed through the DSP,
then to the Class-D amplifier.

Setup Disc: The included setup CD is used to correctly adjust
the input gain. With the amp in setup mode, a test tone is output from the disc
with the radio at full volume (the amplifier output is muted) and the amp measures
the line voltage, guiding you with arrows on the display as you adjust the gain
controls.

Signal Sensing: The MS-A5001 has a remote turn-on terminal
that activates the amp with an input between +5 and 12+ volts DC. If the connected
radio has no remote lead, or you prefer not to use it, turn on the signal sensing
turn-on circuit and the amp will turn on whenever an audio signal is present at
the inputs.

Crossovers: There are independent
high-pass and low-pass crossovers; they can be used individually or both can be
used together as a band-pass crossover. The slope of each is adjustable (6 dB/oct,
12 dB/oct, and 24 dB/oct) and the crossover point has 98 options:

20 Hz to 110 Hz in 1 Hz steps

115 Hz to 140 Hz in 5 Hz steps

Off

Subsonic Filter: The high-pass
crossover can be adjusted to act as a subsonic filter (20 Hz, 21 Hz, etc).

Audio Input: If your radio has no line-level outputs, use
the included adapters to convert the speaker wires to RCA and plug them into
the amplifier's inputs. The differential inputs will accept any signal from
100mV to 20.0V; set the input selector switch to Hi when using speaker-level
inputs. The input selector switch also has a Hi2 position, used to present a
speaker load to factory radios equipped with a circuit that turns the radio
off when an amp is connected.

Wireless Bass Control: An optional MS-WBC wireless bass
control (item number
109MSWBC, sold separately) is available to remotely adjust
the bass output. The MS-WBC communicates via RF signal and requires no physical
connection to the amp; it's also battery powered, but has an optional power wire
if you prefer not to replace the battery periodically. When adjusting the bass
output, the DSP also adjusts the crossover, so the tonal quality of the bass
(and its apparent location) doesn't change.

Controls

Controls:

Input Gain: rotary knob

Input Selector: three position switch;
Lo (line-level RCA), Hi (speaker-level), or Hi2 (used only
with factory radios having a circuit that turns the radio
off when it sees no speaker load)

Input Mixer: one or two inputs can be
used with no need for a Y-adapter; select 1 (mono input),
1/2 (stereo input is summed to mono)

High-Pass Crossover Slope: 6 dB/oct,
12 dB/oct, or 24 dB/oct

High-Pass Crossover Frequency: choose
from 97 options from 20 Hz to 140 Hz, or off

Low-Pass Crossover Frequency: choose
from 97 options from 20 Hz to 140 Hz, or off

Low-Pass Crossover Slope: 6 dB/oct,
12 dB/oct, or 24 dB/oct

Output Level: adjust from 0 to 80;
important when matching tweeters and midrange, subwoofer
and full range speakers, etc

Connections

Inputs and Outputs:

Power and Ground Terminals: set screw
terminals; accept up to 4 gauge bare wire; requires included
4mm Allen wrench

Note: JBL recommends the power and
ground cables be 8 gauge minimum. The recommended accessory
list for the MS-A5001 includes wiring kits with 8 gauge wire
and 60 amp fuses, but the amp has two 40 amp fuses (80 amps
total), so if one of these kits is used a replacement fuse
(at least 80 amps) must also be added. If a 4 gauge wiring
kit is used no additional fuse is necessary.

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